Fixes Admin bugs

[soupette]

Signed-off-by: soupette cyril.lpz@gmail.com

Description of what you did:

This PR fixes #7699 in particular point 2 and 4 of the issue.
Regarding point 1 about the prompt when clicking on an external link this cannot be achieved using react-router.
A workaround could be to use an html <a> tag with `target="_blank" so modifications are not lost when testing a link.

[codecov]

Codecov Report

Merging #7716 into master will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7716      +/-   ##
==========================================
- Coverage   27.16%   27.15%   -0.02%     
==========================================
  Files        1163     1163              
  Lines       15518    15521       +3     
  Branches     2410     2411       +1     
==========================================
- Hits         4216     4215       -1     
- Misses       9534     9537       +3     
- Partials     1768     1769       +1     

Flag	Coverage Δ
#front	19.30% <0.00%> (-0.02%)	⬇️
#unit	53.85% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...c/containers/AuthPage/components/Register/index.js	0.00% <ø> (ø)
...trapi-admin/admin/src/containers/AuthPage/index.js	0.00% <0.00%> (ø)
...admin/admin/src/containers/AuthPage/utils/forms.js	0.00% <ø> (ø)
...-manager/admin/src/components/CustomTable/index.js	0.00% <ø> (ø)
...rc/containers/EditViewDataManagerProvider/index.js	0.00% <0.00%> (ø)
...iners/HomePage/HomePageContent/HomePageSettings.js	0.00% <ø> (ø)
...in/src/components/LeftMenu/LeftMenuFooter/index.js	33.33% <0.00%> (-33.34%)	⬇️

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[alexandrebodin]

LGTM